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Stickering to correct bowing/ cupping? Please help

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Forum topic by Sirgreggins posted 02-21-2013 02:28 AM 882 views 0 times favorited 7 replies Add to Favorites Watch
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Sirgreggins

292 posts in 983 days


02-21-2013 02:28 AM

Hey guys, i just bought some 8/4 and 4/4 S3S Cherry for a wall shelf build. It was my first trip to a lumber yard so i was excited to have pretty stable wood. both were 8 ft boards. I had the 8/4 cut in half and the 4/4 cut into 3rds. After 2 days of sitting in my room (where it will spend its life) the wood is starting to cup, bow and twist. I’m already at the desired thickness and can’t thin anymore since,
1. i dont have a planer yet
2. i dont want my shelves to be any thinner than 3/4

Will stickering the wood and applying some weight and clamps to hold it flat, actually flatten the board(s) out?


7 replies so far

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Loren

7822 posts in 2395 days


#1 posted 02-21-2013 02:48 AM

Some people say that stickering and weighting wood that’s
been resawn or thicknessed can help keep it flatter.

Emphasis on the weighting.

-- http://lawoodworking.com

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Grandpa

3204 posts in 1423 days


#2 posted 02-21-2013 02:54 AM

I would say it might help. You might need to moisten the cupped or concave side. I mean wipe it with a towel tnd weight it to make it straight.

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Sirgreggins

292 posts in 983 days


#3 posted 02-21-2013 02:54 AM

i have a bunch of left over bricks and some clamps i can use i guess i’ll do that and give it a few weeks to acclimate under weight and clamps. anyone else 2nd this school of thought?

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WDHLT15

1211 posts in 1223 days


#4 posted 02-21-2013 03:19 AM

The wood was not in equilibrium with the environment that you stored it in. The moisture content is changing, so that is the reason for the warp and cup. The wood needs to be stored so that air can circulate freely on all sides of each piece. This will allow the wood to come to equilibrium. The worst thing is to lay the boards flat on a surface like a table or floor where only one side is exposed to the air and the other side is not. This en-even moisture distribution is what causes the cupping.

-- Danny Located in Perry, GA. Forester. Wood-Mizer LT15 Sawmill. Nyle L53 Dehumidification Kiln. hamsleyhardwood.com

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JesseTutt

811 posts in 858 days


#5 posted 02-21-2013 03:46 AM

I have never had much luck straightening a warped board. Good luck!

-- Jesse, Saint Louis, Missouri

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TCCcabinetmaker

925 posts in 1102 days


#6 posted 02-21-2013 04:53 AM

I think it is more important to know th conditions that caused the wood to cup in the first place. If there is alot of sunlight in the room, and the boards cupped to the side sun was exposed to then, dampen the cuped side then flip over and then expose the other side to sunlight, this should help flatten the boards some.

-- The mark of a good carpenter is not how few mistakes he makes, but rather how well he fixes them.

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Sirgreggins

292 posts in 983 days


#7 posted 02-24-2013 04:34 PM

well, i’ve had everything stickered for the past few days and the wood is staying flat. I’ll let the boards sit like this for 3 more weeks then build.

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